Hot water generators



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May 24, 1960 s. I STABENOW HOT WATER GENERATORS 5 Sheets-Sheet 4 Filed March 6. 1958 nvmvrom Gewyflabezzo BY ATTORNEYS.

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HOT WATER GENERATORS Filed March 6, 1958 5 Sheets-Sheet 5 25a 24a 25a INVENTOR. Q GemgJZabe/ww, Q Q BY L N 5 4 a/ Q Q ATTORNEYS. Q Q: q

United States Patent HOT WATER GENERATORS Georg Stabenow, East Stroudsburg, Pa., assignor to La Mont Steam Generators, Inc., New York, N .Y., a corporation of Delaware Filed Mar.'6, 1958, Ser. No. 719,651

9 Claims. (Cl. 122356) This invention relates to hot water generators. More specifically, it is concerned with hot water generators of a type in which the water is passed through a tube coil or coils subjected to flame discharged from a jet burner fired with either gas, oil or comminuted solid fuel.

The chief aim of my invention is to provide a hot water generator of the above type which is compact; which lends itself to ready fabrication at relatively small cost; and which is highly economical from the standpoint of fuel consumption.

Other objects and attendant advantages will appearfrom the following detailed description of the attached drawings, wherein:

Fig. 1 is a view in vertical longitudinal section of a hot water generator conveniently embodying my invention.

Fig. 2 is a horizontal section of the generator taken as indicated by the angled arrows II-II in Fig. 1.

Fig. 3 is an end elevation of the generator as viewed from the left of Figs. 1 and 2.

Figs. 4, 5 and 6 aretransverse sectional views taken as indicated by the angled arrows IV-IV, VV and VI-VI in Figs. 1 and 2; and

Fig. 7 isa diagrammatic view showing the several spiral coils and convection coils, and the manner in which said coils are arranged and connected.

As herein exemplified, my improved hot water generator comprises a horizontally-elongate housing 1 which is supported slightly above a foundation 2 of concrete or the like by a pair of lengthwise extending channel rails 3, and which is rectangular in cross section. The side and end walls 4, 5, and 6, 7, the roof 8 and the floor 9 of the housing are all constructed from relatively thick metal-sheathed slabs of thermal insulation. Adjacent one end (Fig. 2), the housing is provided in its opposite side walls 4 and 5 respectively with clean out doors 10 and 11. The generator is fired by means of a jet burner 12 which may be of any suitable commercially available type and whereof the nozzle 13 extends through an opening 14 in the end wall 6 somewhat above the level of the floor 9. For escape of the products of combustion, after they have traversed the housing, there is provided, immediately inward of the end wall 7, a flue 15 which reaches to the floor of the housing and has a forward extension 16.

Arranged within the housing 1 is a plurality of seriallyarranged coaxial tube coils-there being four of these coils in this instance respectively designated 18, 19, and 21-which coils conform in configuration to the cross section of the housing with their convolutions lying close to the side walls 4, 5, roof 8 and fioor 9 of said housing. As shown, the first three coils 18, 19 and 20 of this group are closely spaced relative to each other, but the last coil 21 is separated by a larger interval from its immediate neighbor 20 in the region of the clean out doors 10 and 11. Disposed within the hollow of the end coil 21 and extending partway into the hollow of the coil 20 is a bank of fourserpentine coils 22, 23, 2,4 and of which the convolutions extend back and forth horizontallycrosswise at the housing, said coils having plural layers in spaced vertical relation and being themselves vertically spaced. one from another. The inlet ends 22a, 23a, 24a and 25a of the coils 22, 23, 24 and 25 are connected to a common water inlet manifold 26 (Fig. 7) externally of the end wall 7 of the housing, and the outletends 22b, 23b, 24b and 25b of said coils are connected respectively to the inlet ends 18a,'19a, 20a and 21a'of the coils 18, 19, 20 and 21. The opposite or outlet ends 18b, 19b, 20b and 21b are connected to a common discharge header 27 located externally of the end wall 6 of the housing. Disposed transversely within the housing immediately ahead of the last spiral coil 21 is a vertical baffle 30 which reaches up from the floor 9 to a level about midway .of the height of the housing, and which has a rearward lateral horizontal extension 31 that terminates short of the vertical portion of the flue:

15, the horizontal portion of the latter terminating, in turn, short of the baffle 30v and being overhung by the horizontal extension 31 .of the latter.

Operation In the operation of the generator, the flame from the nozzle 13"of the burner 12 is projected horizontally. through the first three spiral coils 18, 19 and 20 and p then diverted upward by the baflle 30'to pass over the in Fig. 1. In this way it will be seen that the products of combustion, after having traversed the hollows of the spiral coils 18, 19 and 20 is swirled within the coil 21 to pass intimately about the convection coils before .escaping into the flue 15, the water flowing back and forth horizontally in the convection coils and generally counter to the burner jet in the other coils as also shown by arrows in Fig. 1. Since the spiral coils 18, 19,20

and 21 are connected in reverse order of. their number ing to the convection coils 25,21 23 and 22, the tem-;

perature of the different streams of water will be equalized before entering the outlet manifold 26, this equalizing effect being enhanced by the swirling action of the combustion products about the convection tubes in the manner above described. In practice, suitable regulatable thermostatic devcies are provided to control the burner 12 for delivery of heated water at any desired temperature from the apparatus. Because such devices are well known in the art, it was deemed unnecessary to illustrate them in the drawings.

From the foregoing it will be seen that I have provided a simple, compact and eflicient generator whereby water can be continuously and quickly heated with minimum consumption of fuel. It is to be expressely understood that the number of both the spiral coils and of the convection coils may be increased or decreased as may be desired or required to meet various requirements of hot water output.

Having thus described my invention, I claim:

1. A hot water generator comprising an elongate housing; plural hollow spiral tube coils coaxially arranged in serial relation longitudinally throughout the housing; a common water outlet manifold to which one end of each spiral coil is connected; a corresponding number of flat serpentine tube convection coils disposed horizontally in vertically spaced relation, one above another within the hollow of one of the spiral coils; a common water inlet manifold to which one end of each serpentine coil is connected, the other ends of the convection coils being connected respectively with the inlet ends of individual spiral coils; a jet burner at one end of the housing 2 Patented May 24,- 1960 for projecting its products of combustion through the hollows'of thespiral' coils and about the convection coils; and a flue outlet for the products of combustion at the other end of the housing.

2. A hot water generator according to claim 1, in

which the convection coils are disposed within the hollow of the spiral coil at the flue end of the housing.

3. A hot water generator according toclaim 1, in which the convection coils' are disposed within the hollow of the spiral coil at the flue end of the housing, and further including baflie means within the housing for diverting the'products of combustion from the burner to swirl about the convection coils in the one spiral coil after having traversed the hollows of the spiral coils ahead of said one spiral coil and" before entering the flue.

4. A hot water generator'accordingto claim 1', wherein the housing ishorizontally arranged; wherein the burner projects its products of combustion through an opening adjacent the bottom of the corresponding end wall; whereinthe flue extends down through. the top' of the housing at the opposite end to the bottom of the housing and has a" lateral forward extension terminating shortof the baflle; and wherein the bafile extends partway up from the bottom of the housing and has a horizontal portion which terminates somewhat short of the vertical portion ofthe flue and overhangs-the horizontal extension of the flue.

5. A hot water generator according to claim 1, wherein the housing is rectangular,. and in which the spiral coils are similarly configured with their convolutions in close proximity to the sides, to the top andto the bottom of the housing.

6. A hot water generator according to claim 1', wherein the inlet and outlet manifolds are disposed externally of opposite ends of the housing.

7. A hot: water generator according to claim 1, wherein the convection coils are disposed within the hollow of the spiral coil at the flue end of the housing and the burner is disposed at the opposite end of the housing; wherein the convection coils comprise a lowermost convection coil, an uppermost convection coil and intermediate convection coils; wherein the lowermost convection coil is connected to the spiral coil in which the convection coils are disposed; wherein the upper-most convection coil is connected to the spiral coil at' the burner end of the housing; and wherein the intermediate convection coils are individually connected to the remaining intermediate spiral coils.

8. A hot water generator according to claim 1, wherein the convection coils are disposed within the hollow of the spiral coil at the flue end of the housing and the burner is disposed at the opposite end of the housing,

wherein the lowermost convection coil is connected to the spiral coil in which the convection coils are disposed; wherein the uppermost convection coil is connected to the spiral coil at the burner end of the housing; wherein the intermediate convection coils are individually connected to the remaining intermediate spiral coils; and further including baflle means within the housing for diverting the products of combustion from the burner to swirl about the convection coils within the one spiral coil after having traversed the hollows of the spiral coils ahead of said one spiral coil and before entering the flue.

9. A hot water generator according to claim 1, wherein the housing is horizontally arranged; in which the convection coils are disposed in the spiral coil at the flue end of the housing and the burner is disposed at the opposite end of the housing; wherein the lowermost convection coil is connected to the spiral coil in which the convection coils are disposed; wherein the upper-most convection coil is connected to the spiral coil at the burner end of the housing; wherein the intermediate convection coils are individually connected to the remaining intermediate spiral coils; wherein the flue extends down through the top of the housing to the bottom of the housing and there has a lateral forward extension; and further including a baflle extending partway up from the bottorri of the housingforwardly of the spiral coil in which the convection coils are disposed, said baffle having. a horizontal extension at the top terminating short of the vertical portion of the flue and overhanging the horizontal extension of the flue.

References Cited in the file of this patent UNITED STATES PATENTS 

